Question 1

If short hair (L) is dominant to long hair (l), then to determine the genotype of a short-haired animal it should be crossed with

Accepted Answer

To determine the genotype of a short-haired animal, it should be crossed with a long-haired animal that is homozygous recessive for long hair (ll). This is because if the short-haired animal is heterozygous (Ll), the long-haired animal will contribute the recessive allele and show up in the offspring, allowing us to determine the genotype of the short-haired animal. Crossing with an LL individual would not help us determine if the short-haired animal is homozygous dominant or heterozygous, and crossing with another Ll individual would not provide definitive information.

Question 2

If tall (D) is dominant to dwarf (d), and two homozygous varieties DD and dd are crossed, then what kind of progeny will be produced?

Accepted Answer

When two homozygous varieties DD (tall) and dd (dwarf) are crossed, all progeny will be heterozygous Dd, which will express the dominant tall phenotype.

Question 3

A testcross consists of a cross

Accepted Answer

A testcross is done to determine the genotype of an organism with a dominant phenotype but unknown genotype. This is achieved by crossing the unknown organism with a homozygous recessive individual for that trait. The resulting offspring can be analyzed to determine the genotype of the unknown organism.

Question 4

If all offspring of a cross have the genotype Aa, the parents of the cross are most likely

Accepted Answer

The answer of If all offspring of a cross have...

Question 5

According to Mendel, what kinds of genes "disappear" in F₁pea plants?

Accepted Answer

According to Mendel's laws of inheritance, recessive genes can be masked by dominant genes in heterozygous individuals, but will be expressed in homozygous recessive individuals. If F₁pea plants are not expressing the recessive gene, it is likely that they are heterozygous (having one dominant and one recessive gene). When these plants self-fertilize, there is a 25% chance of producing homozygous recessive offspring, which will express the recessive trait. This is how the recessive gene "disappears" in the initial cross, but can reappear in future generations.

Question 6

For Mendel's explanation of inheritance to be correct,

Accepted Answer

Mendel believed that the combination of gametes at fertilization was due to chance, which is known as the law of independent assortment. This was one of the key principles that allowed him to accurately describe the inheritance patterns he observed in peas. The other choices are not necessary for Mendel's explanation to be correct.

Question 7

The F₂ phenotypic ratio of a monohybrid cross is

Accepted Answer

In a monohybrid cross, the F2 generation typically shows a phenotypic ratio of 3:1, where three individuals exhibit the dominant trait and one exhibits the recessive trait.

Question 8

If R is dominant to r, the offspring of the cross of RR with rr will

Accepted Answer

If R is dominant to r, the RR individual will display the dominant phenotype. The rr individual will display the recessive phenotype. The offspring of the cross will all have a heterozygous genotype (Rr), but they will display the dominant phenotype (same as the RR parent) because the dominant allele masks the recessive allele. Therefore, the correct choice is B, as the offspring will display the same phenotype as the RR parent.

Question 9

If short hair (L) is dominant to long hair (l), then what fraction of the offspring produced by a cross of Ll x ll will be homozygous dominant?

Accepted Answer

A cross between Ll and ll will produce offspring with genotypes Ll and ll. There is no chance of producing a homozygous dominant (LL) offspring.

Question 10

The theory of segregation

Accepted Answer

The theory of segregation explains the behavior of a pair of alleles during meiosis. It states that each pair of alleles for a trait separate during gamete formation, with only one allele going into each gamete.

Question 11

The theory of segregation applies most specifically to events occurring in preparation of

Accepted Answer

The theory of segregation, also known as Mendel's first law, states that during gamete formation, the two alleles of a gene segregate from each other such that each gamete receives only one allele. This means that the theory of segregation applies specifically to events occurring in the formation of gametes.

Question 12

In a Punnett square, the letters within the little boxes represent

Accepted Answer

The letters within the little boxes of a Punnett square represent the genotypes of the offspring, showing the possible combinations of alleles they might inherit from the parents.

Question 13

A testcross involves

Accepted Answer

A testcross involves crossing an organism of unknown genotype but with a dominant phenotype with an organism that is homozygous recessive for that trait. This allows the determination of the unknown genotype of the dominant organism by studying the phenotypes of their offspring.

Question 14

A homozygous dominant parent will produce

Accepted Answer

A homozygous dominant parent has two identical copies of the dominant allele, which means that all of its gametes will contain that dominant allele. Therefore, it will produce only one type of gamete with that one homozygous allele.

Question 15

For monohybrid experiments, a testcross can result in which of the following ratios?

Accepted Answer

A testcross involves crossing an individual with a homozygous recessive individual. In a monohybrid testcross, if the individual being tested is heterozygous, the expected phenotypic ratio is 1:1.

Question 16

Mendel found that pea plants expressing a recessive trait

Accepted Answer

Mendel found that expression of a recessive trait in pea plants was only possible if both parents carried at least one copy of the recessive allele. Therefore, when a recessive pea plant was crossed with a homozygous dominant plant, all the offspring in the first generation would be heterozygous, masking the recessive trait. However, in the second generation, the recessive trait reappeared in a 3:1 ratio, indicating that the heterozygous offspring were carriers of the recessive allele. These recessive pea plants expressing the recessive trait were pure-breeding, meaning that they would consistently produce offspring expressing the same trait.

Question 17

Using the illustration below and the assumption that half of a plant's sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is

Accepted Answer

The answer of Using the illustration below and the assumption...

Question 18

Short hair (L) is dominant to long hair (l).If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, this indicates that

Accepted Answer

If the short-haired animal were pure-breeding, all offspring would have short hair. However, the fact that they produced a long-haired offspring indicates that the short-haired animal carries the recessive allele for long hair (heterozygous), meaning it is not pure-breeding. The long-haired animal's breeding status cannot be determined from this information alone.

Question 19

If Mendel had not examined the __________ generation, he would not have discovered his theory of segregation.

Accepted Answer

Mendel's theory of segregation was based on observing the 3:1 ratio of traits in the F2 generation, which revealed the separation of alleles.

Question 20

If short hair (L) is dominant to long hair (l), animals LL and Ll have the same

Accepted Answer

Both LL and Ll have the same phenotype, which is short hair, because the presence of at least one dominant allele (L) results in the expression of the dominant trait.

Quiz 11: Observing Patterns in Inherited Traits

If short hair (L) is dominant to long hair (l) , then to determine the genotype of a short-haired animal it should be crossed with

If tall (D) is dominant to dwarf (d) , and two homozygous varieties DD and dd are crossed, then what kind of progeny will be produced?

A testcross consists of a cross

If all offspring of a cross have the genotype Aa, the parents of the cross are most likely

According to Mendel, what kinds of genes "disappear" in F₁pea plants?

For Mendel's explanation of inheritance to be correct,

The F₂ phenotypic ratio of a monohybrid cross is

If R is dominant to r, the offspring of the cross of RR with rr will

If short hair (L) is dominant to long hair (l) , then what fraction of the offspring produced by a cross of Ll x ll will be homozygous dominant?

The theory of segregation

The theory of segregation applies most specifically to events occurring in preparation of

In a Punnett square, the letters within the little boxes represent

A testcross involves

A homozygous dominant parent will produce

For monohybrid experiments, a testcross can result in which of the following ratios?

Mendel found that pea plants expressing a recessive trait

Using the illustration below and the assumption that half of a plant's sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is

Short hair (L) is dominant to long hair (l) .If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, this indicates that

If Mendel had not examined the __________ generation, he would not have discovered his theory of segregation.

If short hair (L) is dominant to long hair (l) , animals LL and Ll have the same

Quiz 11: Observing Patterns in Inherited Traits

If short hair (L) is dominant to long hair (l) , then to determine the genotype of a short-haired animal it should be crossed with

If tall (D) is dominant to dwarf (d) , and two homozygous varieties DD and dd are crossed, then what kind of progeny will be produced?

A testcross consists of a cross

If all offspring of a cross have the genotype Aa, the parents of the cross are most likely

According to Mendel, what kinds of genes "disappear" in F1 pea plants?

For Mendel's explanation of inheritance to be correct,

The F2 phenotypic ratio of a monohybrid cross is

If R is dominant to r, the offspring of the cross of RR with rr will

If short hair (L) is dominant to long hair (l) , then what fraction of the offspring produced by a cross of Ll x ll will be homozygous dominant?

The theory of segregation

The theory of segregation applies most specifically to events occurring in preparation of

In a Punnett square, the letters within the little boxes represent

A testcross involves

A homozygous dominant parent will produce

For monohybrid experiments, a testcross can result in which of the following ratios?

Mendel found that pea plants expressing a recessive trait

Using the illustration below and the assumption that half of a plant's sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is

Short hair (L) is dominant to long hair (l) .If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, this indicates that

If Mendel had not examined the __________ generation, he would not have discovered his theory of segregation.

If short hair (L) is dominant to long hair (l) , animals LL and Ll have the same

According to Mendel, what kinds of genes "disappear" in F₁pea plants?

The F₂ phenotypic ratio of a monohybrid cross is